Performance analysis of vertical-axis-wind-turbine blade with modified trailing edge through computational fluid dynamics

Lin, Siqi; Lin, Yang; Bai, Chi Jeng; Wang, Wei Cheng

doi:10.1016/j.renene.2016.07.050

Cited by 48 publications

(14 citation statements)

References 17 publications

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“…According to this analysis, there is a clear benefit to applying this tubercle concept in vertical-axis turbines. A verticalaxis turbine with a tubercle profile on the leading-edge of its blade is expected to increase the coefficient of performance, even though there are negative reports from other researchers that this idea is not profitable [24,25,26]. Whilst in contrast, there is also research that reports such foils have a positive effect [27,28].…”

Section: Prospect Of Tubercle Application In a Vertical-axis Turbinementioning

confidence: 99%

Numerical simulation of foil with leading-edge tubercle for vertical-axis tidal-current turbine

Utama¹,

Satrio²,

Mukhtasor³

et al. 2020

JMES

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The main disadvantage of the vertical-axis turbine is its low coefficient of performance. The purpose of this work was to propose a method to improve this performance by investigating the hydrodynamic forces and the flow-field of a foil that was modified with a sinusoidal leading-edge tubercle. NACA 63(4)021 was chosen as the original foil since it has a symmetrical profile that is suitable for use on a vertical-axis tidal-current turbine. The study was conducted using a numerical simulation method with ANSYS-CFX Computational Fluid Dynamics (CFD) code to solve the incompressible Reynolds-Averaged Navier-Stokes (RANS) equations. Firstly, the simulation results of the original foil were validated with available experimental data. Secondly, the modified foils, with three configurations of tubercles, were modelled. From the simulation results, the tubercle foils, when compared with the original foil, had similar lift performances at low Angles of Attack (0-8 degrees of AoA), lower lift performances at medium AoA (8-19 degrees) and higher lift performances at high AoA (19-32 degrees). A tubercle foil with Height/Chord (H/C) of 0.05 can maintain the static stall condition until 32 degrees. Therefore, a vertical-axis turbine with tubercle-blades provides an opportunity to increase its performance by extending the operational range for extracting energy in the dynamic stall condition.

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Section: Prospect Of Tubercle Application In a Vertical-axis Turbinementioning

confidence: 99%

Numerical simulation of foil with leading-edge tubercle for vertical-axis tidal-current turbine

Utama¹,

Satrio²,

Mukhtasor³

et al. 2020

JMES

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show abstract

“…The variation of C p is calculated for all azimuthal increments, and the minimum variation is obtained for 1° azimuthal increment. A reasonable time step size can reduce the error percentage to a very less value and can be selected for future investigation [62]. A time step of 1° is selected for the present simulation for saving the computational cost.…”

Section: Time Step Size Testmentioning

confidence: 99%

Low wind speed aerodynamics of asymmetric blade H-Darrieus wind turbine-its desired blade pitch for performance improvement in the built environment

Mazarbhuiya

Biswas

Sharma

2020

J Braz. Soc. Mech. Sci. Eng.

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An asymmetric blade vertical-axis wind turbine (VAWT) is one of the emerging technologies for harvesting power in the built environment, which has low wind speed. Although asymmetric blade improves VAWT's performance, the effect of blade pitch angle on its design is hardly ascertained. In this paper, unsteady 2D Reynolds-averaged Navier-Stokes CFD simulations are carried out to investigate the effect of blade pitch angle on the aerodynamic performance of a NACA 63-415 asymmetric blade H-Darrieus VAWT at a low wind speed of 6.0 m/s. Its detailed flow physics at different operating and pitch angle conditions is investigated, and important performance insights are obtained to elucidate its desired blade pitch for performance improvement. The present study shows that positive pitch angle (+ 5°) improves the turbine performance in upwind position, whereas negative pitch angle (− 5°) augments the turbine performance in downwind position as well as causes less wake effect than positive pitch angle. Further, optimal pitch angle (+ 5°) is found out at which the maximum power coefficient of 0.271 is obtained for an operating tip speed ratio 2.4. The present study delineates how desired blade pitch improves the performance of asymmetric blade VAWT for sustainable power generation in the built environment.

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“…The result shows that slotted design performed better than straight blade in terms of power, meanwhile tubercle design performance deplete. Lin et al [9] compare the performance of tubercle blade wind turbine with straight design, the result shows improvement of 0.38% to 2.31% increase in thrust. In addition, Riyadh Belamadi [10] study the performance of slotted wind turbine airfoils.…”

Section: Continuous Development and Optimization Of Unmannedmentioning

confidence: 99%

Aerodynamic Performance Characterization and Static Structural Analysis of Slotted Propeller: Part A Effect of Position

Seeni¹

2019

MMEP

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In this paper, novel slotted propeller blade design performance is presented in terms of thrust coefficient, power coefficient and efficiency by utilizing ANSYS Fluent. The effects of slotted positions were discussed with respect to baseline APC Slow Flyer 10' x 7' configurations. Seven slot locations with respect to chord length, 12.5%, 25%, 37.5%, 50%, 62.5%, 75% and 87.5% were tested. The result shows that introduction of slot along the propeller blade increases the thrust coefficient, with range of 0.1% to 4.74% for low advance ratio. However, increase in thrust coefficient also causes increase in power coefficient, ranging from 10.38% to 44.59% compared to baseline design, hence reducing propeller efficiency. In addition, structural integrity of the blade was tested. Pressure distribution of the propeller blade demonstrated higher pressure on the back section, and lower pressure at the front section which produces thrust. In addition, the result shows that pressure distribution are highly influenced by changes of advance ratio. The analysis shows that the propeller design managed to withstand stress and strain breaking point when operated at high advance ratio.

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Performance analysis of vertical-axis-wind-turbine blade with modified trailing edge through computational fluid dynamics

Cited by 48 publications

References 17 publications

Numerical simulation of foil with leading-edge tubercle for vertical-axis tidal-current turbine

Numerical simulation of foil with leading-edge tubercle for vertical-axis tidal-current turbine

Low wind speed aerodynamics of asymmetric blade H-Darrieus wind turbine-its desired blade pitch for performance improvement in the built environment

Aerodynamic Performance Characterization and Static Structural Analysis of Slotted Propeller: Part A Effect of Position

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